Reversing device for multicylinder internal-combustion engines.



G. H W. URE N. V v BEVERSING DEVICE FOR M ULTIOYLINDER INTERNALCOMBUSTION ENGINES.

APPLICATION FILED AUG. 24, 1911. v

1,017,350, Patented Feb. 13, 1912.

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GUSTAV HEINRICH WILHELM UREN, OF AACI-IEN, GER-MANY, ASSIGNOR 'IO AACHE-N ER STAHLWAARENFABRIK FAFNIR-WER-KE AKTIENGESELLSCHAFT, OF AACHEN,

GERMANY.

Specification of Letters Patent.

Patented Feb. 13, 1912.

Application filed August 24, 1911. Serial No. 645,810.

T 0 aZZ whom it may concern:

Be it known that I, GUSTAV HEINRICH \VILHELM UREN, engineer, a subjectof the King of Prussia, German Emperor, residing at Aachen, in theKingdom of Prussia and German Empire, have invented certain new anduseful Improvements in Reversing Devices for MulticylinderInternal-Combus tion Engines, of which the following is a specification.

My invention relates to multi-cylinder in ternal combustion engines andthe object of my invention is to provide improved means for effectingreversal.

According to my invention, only a single fuel supply pipe is providedfor each cylinder and, in connection therewith, only one fuel supplydevice and one actuating mem ber therefor. IVhen the engine is to be reversed, the actuating members for the fuel supply devices are shifted insuch a way that some of the actuating menbers will act on the fuelsupply devices of oppositely acting cylinders. After the reversal hasbeen effected, all the actuating members are automatically returned totheir initial positions.

Moreover, according to my invention, a larger amount of fuel is suppliedto the cylinders, when the engine is reversed, whereby a richer mixtureis produced, so that, even at a low degree of compression, the mixtureis ignited with certainty during the compression stroke.

The drawing shows one of the cylinders of a fourcylinder engine and thefuel sup ply devices together with the operating devices therefor.

It is assumed that the cranks of the first and fourth cylinders aresimilarly disposed and those of the second and third cylinders set at anangle of 180 relatively to the former.

It is also assumed for the sake of simplicity that the invention isapplied to a two-cycle motor. In this case the power strokes follow eachother at intervals of 180 each and the first and fourth cylinders andthe second and third cylinders operate simultaneously.

The fuel supply members a Z) 0 (Z belonging to the four cylindersrespectively are operated in any convenient nammer c. g. by the cams e fg h, the cam 6 operating the fuel supply member a connected with thefirst cylinder, the cam f the fuel supply member 6 connected with thesecond cylinder, the cam g the fuel supply member 0 connected with thefourth cylinder and the cam 7b the fuel supply member (Z which isconnected with the third cylinder. The cams are driven by a motor shaftand can be adjusted, for reversing purposes, in any convenient manner.In the constructions as shown a fork 2'. fixed to a slide bar 79 isemployed.

The slide bar 70 is connected with a device of a known type which, afterreversal has taken place, will return the operating devices of the fuelsupply devices to their original positions.

In the drawing a link Z is shown which link is connected with a slottedlever m. The slot at is centrally pivoted at 'n, and is pivotallyconnected by a rod 0 with a bushing 9 'rotatably mounted upon thedriving shaft 10. This bushing is split and is held together by springpressure so that owing to slight frictional contact with the shaft it isdriven by the latter. In order to limit the movements of lever m, twostops 1' and s are provided as shown. A rod 2? pivotally connects thelink Z wit-h the hand lever o which is pivoted at u and serves forreversing the engine.

Reversal is effected in the following manner: By pulling the lever 12 tothe right into the position marked Backwards the lower end of the link Zis moved upward in the slot of lever m and the rod 70 with the fork '5and the camsc f g 72, are raised to such an extent that f and it now actupon the fuel supply members a and c of cylinders I and IV. Suitabledevices can be interposed to prevent the cams f and h from operating thefuel supply members a and 0 until the speed of rotation has beensuiiiciently reduced. As the cams f and h are arranged at an angle of180 relatively to the cams e and 9, fuel is supplied to the cylinders Iand IV the pistons of which are approximately at the lower dead center.Thus premature ignition is caused the pistons are driven back andthereby the engine is reversed. As soon as the crank shaft rotates inthe opposite direction, however,,the bushing 39 is rotated in the samedirection by the driving shaft 10 and the rod 0 and lever m are drawndownward against the stop 1". As lever m is connected by Z, 70 and iwith the cams, the latter are returned to their initial positions andoperate the fuel supply members in such a manner that fuel admissionagain takes places at the normal time. As a result the motor continuesto rotate in the reversed direction.

In order again to cause the motor to run in a forward direction, thelever 01 is brought into the forward position after which the operationjust described is repeated.

By a constructional modification either the fuel supply members or theoperating cams can be so formed that during reversal a larger quantityof fuel is supplied to the operative cylinders. In the construction asshown the stroke ratios of the cams are different, the stroke of thecams f and 71 being greater than. that of the cams c and In forward andreversed running this eX-erts no influence upon the stroke of the fuelsupply members as the effective stroke of the fuel supply members iscalculated in sucl a manner as to deliver always equal quaiv tit ies offuel. As soon. however, as the cams 7 and h are shifted so that theywill operate the fuel supply members a and when reversing the differenceof stroke exerted on these members will be noticed as a larger quantityof fuel will be supplied. The richer mixture thereby producedlargelyassists in producing rotation in the reversed direction as a richermixture can he ignited at alower compression and the backward stroke ofthe piston is effected with greater certainty.

The fuel supply members may be mount ed in any other relative positionsand they may be ope ated by cams. or the like, directly or with theinterposition of transmit ting gear such as levers or the like. The fuelsupply device can also be constructed in such a manner that the fuel isinjected into the cylinders with the use of compressed air or the like.

I claim:

1. Reversing mechanism for multi-cylinder internal combustion engines,comprising, in combination with the cylinders, fuel supply devices, onefor each cylinder, an actuating member for each fuel supply device, andmeans for operatively connecting some of said actuating members with thefuel supply devices of oppositely acting cylinders for the purpose ofreversing the engine.

Reversing mechanism for multi-cylinder internal combustion enginescomprising, in combination with the cylinders. fuel supply devices, onefor each cylinder, an actuating member for each fuel supply device,means for operatively connecting some of said actuating members with thefuel supply devices of oppositely acting cylinders for the purpose ofreversing the engine, and means for auton'latically returning theactuating members to their initial positions.

3. Reversing mechanism for multi-cylinder internal combustion enginescomprising, in combination with the cylinders, fuel supply devices. onefor each cylinder, an actuating member for each fuel supply device andmeans for operatively connecting some of said actuating members with thefuel. supply devices of oppositely acting cylinders for the purpose ofreversing the engine, said actuating members being so con structed as tosupply an increased amount of fuel when the engine is reversed.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

GUSTAV HEINRICH WILHELM UltEN.

Vitnesses EDMUND JAnvLY, HENRY Cms. COLFXEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

